Bell is one of the main antoganist of Powerpuff Girls Crossover.
She is an original character and is also a Shadowpuff Girl.
She later appeared when Blossom sat down at a tree outside when suddenly Blossom was attacked by Bell and Mojo. After a fight between Bell and Blossom, Mandark came with Clusters and they captured Blossom.
During the fight between Dexter and Mandark, Bell was already sleeping but Dr. X told to Sebastian about the past of Mandark and that when Mandark was in his depression because he killed Dee Dee, Bell came to him and took him with her home. Bell saw Mandark as her big brother. When Mandark was killed Bell was very angry at her father for doing nothing and just letting him kill Susan. Until she & Dr.x joined Megatron.